Below the line is a paste from the FCC Rules applying to the legal limits for unlicensed systems transmitting on a carrier frequency of 1710 kHz.
Note that for transmissions having an r-f bandwidth of 10 kHz as defined there, the maximum e-m field intensity existing 30 meters from the transmit antenna is limited to about 17 µVm.
That 17 µVm field intensity is below the 1710 kHz ambient r-f noise level at most outdoor receive locations -- where it could not provide useful reception even at 30 meters, let alone to indoor receivers in a city neighborhood having a diameter of a mile or more.
OTOH, the field intensity from a transmit system fully compliant with §15.219 can GREATLY exceed 17 µV/m at a distance of 30 meters.
Even an unlicensed system operating at ~1400 kHz and below and fully compliant with FCC §15.209 is permitted to radiate fields greater than 17 µV/m a distance of 30 meters.
Given all this, why would one choose to operate a Part 15 AM compliant system using a carrier frequency of 1710 kHz?
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e-CFR data is current as of September 7, 2016
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Title 47 → Chapter I → Subchapter A → Part 15 → Subpart C → §15.223 |
Title 47: Telecommunication
PART 15—RADIO FREQUENCY DEVICES
Subpart C—Intentional Radiators
§15.223 Operation in the band 1.705-10 MHz.
(a) The field strength of any emission within the band 1.705-10.0 MHz shall not exceed 100 microvolts/meter at a distance of 30 meters. However, if the bandwidth of the emission is less than 10% of the center frequency, the field strength shall not exceed 15 microvolts/meter or (the bandwidth of the device in kHz) divided by (the center frequency of the device in MHz) microvolts/meter at a distance of 30 meters, whichever is the higher level. For the purposes of this section, bandwidth is determined at the points 6 dB down from the modulated carrier. The emission limits in this paragraph are based on measurement instrumentation employing an average detector. The provisions in §15.35(b) for limiting peak emissions apply.
(b) The field strength of emissions outside of the band 1.705-10.0 MHz shall not exceed the general radiated emission limits in §15.209.
No one from part15(dot)us is transmitting on 1710 kHz.
Why are you posting about a non-existant problem?
LOL at Carl Blare!
Anything Rich posts is in the interest of part 15.
Don't be so hard on the guy.
Bruce.
People post on forums and other people post replies then more people come along and post their thoughts.
As MrBruce says, "Anything Rich posts is in the interest of part 15."
That's what's good about it.
Per Mr Blare: No one from part15(dot)us is transmitting on 1710 kHz.
Below is a link (active as of just now) that states otherwise, per its title: Druid Hills Radio AM 1710.
http://www.druidhillsradio.com/
That's old business from way back... Mr. Druid Hills now operates an LPFM station for a genuine campus.
His legacy part 15 website hasn't been updated to reflect changes.
I'm almost positive.
Per Mr Blare: "Mr. Druid Hills now operates an LPFM station for a genuine campus."
Note that (licensed) LPFM stations are not the same as (unlicensed) campus broadcast setups.
Campus broadcasting analogous to FCC §15.221 for the AM band is not permitted in the FM broadcast band by any paragraph(s) of FCC Part 15.
Mr Blare posted: "His legacy part 15 website hasn't been updated to reflect changes. I'm almost positive."
I'll wait for Mr Druid Hills to respond, thanks.
Police power, albeit in the micro-arena of milli-watts, can be a huge head trip.
Do you have a special costume you wear for your part 15 crack-downs?
MorningDJ it's good to have you back after a long absence.
You don't need to like me... I like YOU!
Rich's minion.
MorningDJ does have a point Carl, Rich (and I am not making a joke here) does have a lot of beneficial things to contibute to this hobby.
Some might find him annoying, but he does make us think more with our brains, which is the best part to think with to get ahead in this hobby.
He is just a person, who feels if you make a statement, specially regarding legal part 15 broadcasting, back it up with proof, here-say is what confuses people who are trying to abid by the laws of their given Government.
I see his (Rich) points and concerns as being valid ones. At least Rich backs up anything he posts or says with reliable proof, I'll give him that.
Bruce.
If MorningDJ and MrBruce would agree to come on board as my forum advisors maybe I could produce better posts.
Get together and consider that proposal, then let me know.
In the meantime Rich has once again thrown the topic out of focus.
The topic is part 15 use of 1710 kHz.
But Rich IS the TOPIC CREATOR. He can do as he wishes with it.
Bruce.
Actually, I was wondering the same thing as Carl - what is the point of the original post?
I agree that Rich has much to contribute.
But this seems to be a topic in search of a reason to exist. Other than pure information, of course.
Carl: "Police power, albeit in the micro-arena of milli-watts, can be a huge head trip. Do you have a special costume you wear for your part 15 crack-downs?"
Good grief, man, don't you have something else to do with your time? You comment on almost every post on every subject...holy smokes, you are annoying. Give it a rest. I can anticipate your reply (you can't resist)--'well, just don't read it'. Some people here are serious and post things worthwhile--you are the exception. RARELY do you contribute anything substantial. Your fellow member bashing needs to stop--your very childish comments have run their course.